Micrometer-protractor.



A. A..LEDERER.

'MICROMETER -PROTRACTOR. APPucATmN man 111/111. 2e. 1915.

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ALBERT LEDERER, OF BUFFALO, NEW YORK.

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'I liSpecilcacion of Letters Patent.

Patented July ao, i915.

i Application led March 26, 1915. Serial No. 17,168.

To aZZwz-om Maag .concern Be itv known that I, ALBERT A. LEDERER, a

citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have-invented certain new and useful Improvements in Micrometerlrotractors, of whichthe following is a specification. Y f j My invention relates .to micrometer'protractors -and particularly to means connectwhich it was originally made, without materially changing the constructiony of such an instrument, while incorporating the said means thereon.

Another object is to so construct the said means, as an attachment,lthat a horizontal clamping action can be made, upon which to base an angular adjustment, and thereafter executeV a transverse clamping action, to bind said parts tightly together vertically, without interfering with the said horizontal clamping action and the adjustment connected therewith. v

A further object of this invention is to provide an attachment, which can be easily read for very small changes in angular adjustment, and which will be simple in construction, and one which can be cheaply, but substantially made, so that it will be p ossible to sell the same at a popular price,

either as a complete instrument or to provide the said means'as an attachment to another instrument.'l

The standard straight bar, cularplate, from the center of which, pro-v jects'a threaded post, which is also integral. with Vthe said circular plate. Concentric with the said post is a disk, having a zero mark and sometimes a Vernier. Journaled on the said post, and fixed to the said disk, is a radial leaf, the outer end of which engages a transverse fiat bar or straight edge. 0n the upper threaded end of the post, is a nut which clamps the parts together. Such protractor comprises a drawings and what I integral' with a graduated ciran instrument can be adjusted by hand, for coarse readings of arc only. To render such an instrument adjustable and readable to the-finer or closer changes in angular posit1on, I have devised the means which are hereinafter described and illustrated in the claim is set forth.

In the,drawings like figures refer tolike parts. Y

Figure l is a top plan View of a standard protractor showing my attachment. Fig. 2 is a section taken on the line X-X of Fig. Fig. 3 is a sectional elevation of the adjustable parts for-making line angular adjustment and readings. Fig. 4 is a perspec- -tive view of thehorizontal clamp used and showing three pins in loose transverse engagement therewith. Fig. 5 is a perspective View of a triangular bracket. Fig. 6 is a perspective view of the pivoted and threaded bearing.

In Fig. 1, 1 is a graduated circular plate,

extended to form the straight bar portion 2,

and the arm. From the 1, projects the post 4, upon which is journaled a disk 5. Also journaled on the said post 4, and fixed to the disk 5, by the screw 6, is the radial leaf 7, which engages the straight edge bar 8, and is clamped thereto by means of the thumb screw 9. In threaded engagement with the l0, the lower outer surface of which is smooth for engagement and the upper outer surface, of which is threaded for engagement with the nut 12. The clamp 1l has jaws 13, which may be drawn together by the screw 14. Extending from the clamp l1, is an end of which, is pivoted center of the plate a bearing 16. Fixed upon which is pivoted a threaded bearing 18. A rod 19, in threaded engagement with the bearing 18, is journaled with the bearing 16, and has a collar 19b which shoulders on the bearing 16. The bearing 16' is extended to form a conical part 20, having a zero mark. A graduated and lmurled cylinder 21 engages the rod 19 and butts up against the part 20. The rod 19 terminates in one end in a knurled knob 22 and upon the opposite end of the rod 19 is a knurled nut 23. Passing loosely through holes in the clamp 11, are three pins 24. These pins are a little longer than the thickness of the clamp 11. In contact with the upper end of these pins,

with the clamp 11,

arm 15, to the outer' post 4, is the sleeve plate 1, the

shown to be thinner toward its is a thin washer 2 5, over which is the nut 12. While in contact, the lower ends of said pins 24 is a washer 25a. Y

In Fig. 2 is shown in section, the circular post 4, projecting above the plate 1, the sleeve 10 in threaded engagement with the post 4, the clamp 11 engaging the sleeve 10, and the pins 24, passing through the clamp 11, engaging the sleeve 10, andp the pins 24, passing through the clamp 11, havingv their upper ends in contact with the washer 25 and the lower ends in contact with the washer 25a.

In Fig. 3, is shown the rod 19, .in threaded engagement with the bearing 18, which 1s pivoted to the triangular bracket 17. The

rod 19 is shown journaled in the bearing 16,

and adapted to revolve within an annular recess of the conical extension 20, is the collar 19a, integral with the rod 19. The bearing.

16 is'pivoted to the arm 15 (of the c lamp 11) by the screw 15a. The graduatedcyllnder 21 is journaled on the rod 19 and its outer fiat surface is recessed to receive the shank ofthe nut 23, in threaded engagement with the rod 19.

In Fig. 4, the pins 24 are shown partially entering holes in the clamp 11. These pins 24, when in use in the assembled device extend only a short distance beyond the upper and lower faces ofthe clamp 11.

In Fig. 5, the triangular bracket 17, 1s small end, so as to be adapted to lie over the leaf'7, while being screwedto the disk 5. (See Fig. 1.) In the small end of the bracket 17 is the hole 17a.

In Fig. 6 is shown the threaded bearing 18 with its lower pivot end 18, adapted to engage the hole 17a in the bracket 17 (see Fig. 5).

. When using the form of my invention shown in the figures, referring particularly Ato Fig. 1, lthe. operator begins to set the parts 2 and 8, approximately to the angle desired, or that to be measured, having first loosened the nut'12. After roughly setting the instrument to the angle desired, he turns the screw 14 to tighten the clamp 11, upon the sleeve 10, which has previously been made tight upon the post 4. He is nowthe fine adjustment and this he ready forv turning the threaded rod 19 for can get by 'a reading upon the vernier 5a or on the graduated cylinder 21. There is a relation between the pitch of thread on the rod 19, the radial distance of the axis of the rod 19 from the center of the post 4, the diameter of the cylinder 21 and the spacing of the calibrated circumferential marks upon the cylinder 21, to denote small increments of angle in' adjustment. This relation is predetermined before making up the instrument, so as to read to as fine an increment of angle as desired. After making the nut A 23 loose, the cylinder 21 can be turned with reference t0 the zero mark on the cone 20, and afterward clamped against the collar 19l .by tightening the nut 23, so that the cylinder 21 will turn with the rod 19.

After the operator has adjusted the instrument to the desired angle, he next tightens the nut 12 (see Fig. 2) to causethe ins 24 to force the washer 25a to press the leaf 7, and disk 5, hard against the plate 1, binding thees parts together and setting them to retain the angular position of the parts 2 and 8, after adjustment. The use of the pins 24 does not in any way disturb the hold ofthe clamp 11 upon the sleeve 10, which acts as part of the post 4.

As the details of my invention may be varied, without departing from the spirit of the same, I do not wish to be confined to'. the details herein illustrated and described.

Hence I claim: Y

1. In a micrometer protractor, the combination of a graduated circular plate having a straight edged extension and a central member integral with said plate, Aa disk on said plate adapted to turn concentric to said member, a leaf extending from said disk to which itis fixed, a straight edged piece slidably engaging said leaf transverse to the same and adapted to be clamped thereto, a bracket fixed to .said disk, a threaded bearing pivoted to' said bracket, clamping means engaging said central member, a journal bearing pivoted to said clamping means, a rod in threadedengagement with said threaded bearing and journaled with said journal bearing, and means holding said rod from longitudinal movement in said journal bearing. c f

2. In a micrometer protractor, the combination of a graduated ci'rcular plate having a straight edged extension and a central member integral with said plate, a disk on said member adapted to turn concentric to said post, a leaf extending from said disk to which it is fixed, a straight edged piece 'slidably engaging said leaftransverse to so l bearing pivoted to said clamping means, a

rod in threaded engagement with said threaded bearing and journaled with said j journal bearing, means holding said rod from longitudinal movement in said journal bearing, and a graduated cylinder concentric with and adapted to be clamped on said rod. i

3. In a micrometer protractor, the combination of a graduated circular plate having a straight edged extension and a central post integral with said plate, a diskon said 'plate adapted to turn Vconcentric to said member, a leaf extending from Vsaid disk to ably bracket fixed to said disk, a threaded bearing 'pivoted to said bracket, lclamping means engagingsaidcentral member,j a journalv bearing pivoted tosaid lclamping meansna rod invthreaded engagement With/said threaded bearingand journaled With `said journal bearing, means holding said rod from longitudinal movement in said'journal bearing, a graduated cylinder concentric with and adapted to be clamped on said rod,

' and other clamping means adapted to bind the disk and said plate vertically, said other clamping means being independent of said first mentioned clamping means in its action.

4. In a micrometer protractor, the combination of a graduated circular plate having a straight edged extension and a central post integral With said plate, a sleeve engagmg said post, a disk on said plate adapted to turn concentric to said post,- a leaf extending from said disk to vvhich it is fixed, .a straight edged piece slidably engaging said leaf transverse to the same and adapted to be clamped thereto, a bracket fixed to said disk, a threaded bearing pivoted to said bracket, clamping means engaging saidsleeve on said post, a journal bearing pivoted to said clamping means, a rod in threaded engagement With said threaded bearing and journaled With said journal bearing, and means holding said rod from longitudinal movement in said journal bearing. j

In a micrometer protractor, the combination of a graduated circular plate' having a straight edged extension and a central post integral with said plate, a sleeve engaging said post, a disk on said plate adapted to turn concentric to said post,

fromsaid disk to which it is fixed, a straight edged piece slidably engaging said leaf transverse to the same and adapted to be clamped thereto, a bracket fixed to said disk, a threaded bearing pivoted to said bracket, clamping means engaging said sleeve on said post, a journal bearing pivoted to said clamping means, a rod in threaded engagement with said threaded bearing and journaled with said journal bearing, means holding said rod from longitudinal movement in said journal bearing, and a graduated cylinder concentric with and adapted to be clamped on said' rod.

6. In a micrometer protractor, the combination Vof a graduated circular plate having a straight edged extension and a central post integral with said plate, a sleeve engaging saidpost, a disk on said plate adapted to turn concentric to said post, a leaf extendi ing from said disk towhich it is fixed, a straight edged piece slldably engaging said leaf transverse to the same and adapted to be clamped thereto,

a bracket fixed to said a leaf extending disk, a lthreaded bearing pivoted to 4said bracket, clamping means engaging said .sleeve a journal bearing pivoted to-said a rod in threaded engagefv clamping means, mentwith said threaded bearing and journaled With said journal bearing, means holding said rod from longitudinal movement in said journal bearing, concentric with and adapted to be clamped on said prod, and other clamping means adapted to bind the disk and said plate vertically, said other clamping means being independent of said first mentioned clamping means in its action.

l7.v In a -micrometer protractor, the combination of a graduated circular plate having a straight edged extension `and a central post integral jWith said plate, a sleeve engagmg said post, a disk on said plate adapted to turn concentric to said post, a leaf extending from said disk to which it is fixed, a straight edged piece slidably engaging said leaf transverse to the' same and adapted to be clamped thereto, a bracket fixed to said disk, a threaded bearing pivoted to said bracket, clamping means engaging said sleeve on said post, a journal bearing pivotedto said clamping means a rod in threaded engagement iwith said threaded bearing and journaled with said journal bearing, means holding said rod from longitudinal movement in said journal bearing, and pins passing throughtransverse holes in said clamping means near said sleeve, said pins being each -longer than the thickness of the part of said clamping means surrounding said sleeve, a nut in threaded engagement With said sleeve, said pins being positioned to transmit a binding action from said nut to said disk to force the same vertically against said plate.

8. In a micrometer protractor, the combination of a graduated circular plate having a straight edged extension and a central post integral with said plate, a sleeve engaging said post, a disk on said plate adapted to turn concentric to said post, a leaf extending from said disk to Which it is fixed, a straight edged piece slidably engaging said leaf transverse to the same and adapted to be clamped thereto, a bracket fixed to said disk, a vthreaded bearing pivoted to said bracket, clamping means engaging said sleeve on'said post, a journal beara graduated cylinder ias ing from said straight edged said sleeve, a nut in threaded engagement vWith said sleeve, said pins being positioned to transmit a binding action from said 'nut to said disk to force the same vertically against said plate.

9. In a micrometer protractor, the combination of a graduated circular plate having a straight edged extension and a central post -integral With said plate, a sleevevengagingdisk on said plate adapted to' ment vWith said threaded bearing and journaled` with said journal bearing, means holding said rod fromlongitudinal movement insaid journal bearing, a graduated cylinder concentric with and adapted to be clamped on said rod, and other clamping means adapted to bind the'disk and said platevertically, said other clamping meansbeing independent of said ,irst mentioned clamping means in its action, and pins passing through transverseholes in said clamping means near said sleeve, said pins being each longer than the thickness of the part of Y said clamping means surrounding said sleeve, a nut in threaded engagement 'With said sleeve, said pins being positioned to transmit a binding action from said nut to v said disk to force the same verticallj7 against said plate. l

' ALBERT A. LEDERER.

` Witnesses: f C. C. JOHNSTON, CoRA M. HINES. 

